<?php
/**
 * Smarty plugin
 *
 * @package Smarty
 * @subpackage PluginsFunction
 */

/**
 * Smarty {fetch} plugin
 *
 * Type:     function<br>
 * Name:     fetch<br>
 * Purpose:  fetch file, web or ftp data and display results
 *
 * @link http://www.smarty.net/manual/en/language.function.fetch.php {fetch}
 *       (Smarty online manual)
 * @author Monte Ohrt <monte at ohrt dot com>
 * @param array                    $params   parameters
 * @param Smarty_Internal_Template $template template object
 * @return string|null if the assign parameter is passed, Smarty assigns the result to a template variable
 */
function smarty_function_fetch($params, $template)
{
	if (empty($params['file'])) {
		trigger_error("[plugin] fetch parameter 'file' cannot be empty",E_USER_NOTICE);
		return;
	}

	// strip file protocol
	if (stripos($params['file'], 'file://') === 0) {
		$params['file'] = substr($params['file'], 7);
	}

	$protocol = strpos($params['file'], '://');
	if ($protocol !== false) {
		$protocol = strtolower(substr($params['file'], 0, $protocol));
	}

	if (isset($template->smarty->security_policy)) {
		if ($protocol) {
			// remote resource (or php stream, …)
			if(!$template->smarty->security_policy->isTrustedUri($params['file'])) {
				return;
			}
		} else {
			// local file
			if(!$template->smarty->security_policy->isTrustedResourceDir($params['file'])) {
				return;
			}
		}
	}

	$content = '';
	if ($protocol == 'http') {
		// http fetch
		if($uri_parts = parse_url($params['file'])) {
			// set defaults
			$host = $server_name = $uri_parts['host'];
			$timeout = 30;
			$accept = "image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, */*";
			$agent = "Smarty Template Engine ". Smarty::SMARTY_VERSION;
			$referer = "";
			$uri = !empty($uri_parts['path']) ? $uri_parts['path'] : '/';
			$uri .= !empty($uri_parts['query']) ? '?' . $uri_parts['query'] : '';
			$_is_proxy = false;
			if(empty($uri_parts['port'])) {
				$port = 80;
			} else {
				$port = $uri_parts['port'];
			}
			if(!empty($uri_parts['user'])) {
				$user = $uri_parts['user'];
			}
			if(!empty($uri_parts['pass'])) {
				$pass = $uri_parts['pass'];
			}
			// loop through parameters, setup headers
			foreach($params as $param_key => $param_value) {
				switch($param_key) {
					case "file":
					case "assign":
					case "assign_headers":
						break;
					case "user":
						if(!empty($param_value)) {
							$user = $param_value;
						}
						break;
					case "pass":
						if(!empty($param_value)) {
							$pass = $param_value;
						}
						break;
					case "accept":
						if(!empty($param_value)) {
							$accept = $param_value;
						}
						break;
					case "header":
						if(!empty($param_value)) {
							if(!preg_match('![\w\d-]+: .+!',$param_value)) {
								trigger_error("[plugin] invalid header format '".$param_value."'",E_USER_NOTICE);
								return;
							} else {
								$extra_headers[] = $param_value;
							}
						}
						break;
					case "proxy_host":
						if(!empty($param_value)) {
							$proxy_host = $param_value;
						}
						break;
					case "proxy_port":
						if(!preg_match('!\D!', $param_value)) {
							$proxy_port = (int) $param_value;
						} else {
							trigger_error("[plugin] invalid value for attribute '".$param_key."'",E_USER_NOTICE);
							return;
						}
						break;
					case "agent":
						if(!empty($param_value)) {
							$agent = $param_value;
						}
						break;
					case "referer":
						if(!empty($param_value)) {
							$referer = $param_value;
						}
						break;
					case "timeout":
						if(!preg_match('!\D!', $param_value)) {
							$timeout = (int) $param_value;
						} else {
							trigger_error("[plugin] invalid value for attribute '".$param_key."'",E_USER_NOTICE);
							return;
						}
						break;
					default:
						trigger_error("[plugin] unrecognized attribute '".$param_key."'",E_USER_NOTICE);
						return;
				}
			}
			if(!empty($proxy_host) && !empty($proxy_port)) {
				$_is_proxy = true;
				$fp = fsockopen($proxy_host,$proxy_port,$errno,$errstr,$timeout);
			} else {
				$fp = fsockopen($server_name,$port,$errno,$errstr,$timeout);
			}

			if(!$fp) {
				trigger_error("[plugin] unable to fetch: $errstr ($errno)",E_USER_NOTICE);
				return;
			} else {
				if($_is_proxy) {
					fputs($fp, 'GET ' . $params['file'] . " HTTP/1.0\r\n");
				} else {
					fputs($fp, "GET $uri HTTP/1.0\r\n");
				}
				if(!empty($host)) {
					fputs($fp, "Host: $host\r\n");
				}
				if(!empty($accept)) {
					fputs($fp, "Accept: $accept\r\n");
				}
				if(!empty($agent)) {
					fputs($fp, "User-Agent: $agent\r\n");
				}
				if(!empty($referer)) {
					fputs($fp, "Referer: $referer\r\n");
				}
				if(isset($extra_headers) && is_array($extra_headers)) {
					foreach($extra_headers as $curr_header) {
						fputs($fp, $curr_header."\r\n");
					}
				}
				if(!empty($user) && !empty($pass)) {
					fputs($fp, "Authorization: BASIC ".base64_encode("$user:$pass")."\r\n");
				}

				fputs($fp, "\r\n");
				while(!feof($fp)) {
					$content .= fgets($fp,4096);
				}
				fclose($fp);
				$csplit = preg_split("!\r\n\r\n!",$content,2);

				$content = $csplit[1];

				if(!empty($params['assign_headers'])) {
					$template->assign($params['assign_headers'],preg_split("!\r\n!",$csplit[0]));
				}
			}
		} else {
			trigger_error("[plugin fetch] unable to parse URL, check syntax",E_USER_NOTICE);
			return;
		}
	} else {
		$content = @file_get_contents($params['file']);
		if ($content === false) {
			throw new SmartyException("{fetch} cannot read resource '" . $params['file'] ."'");
		}
	}

	if (!empty($params['assign'])) {
		$template->assign($params['assign'], $content);
	} else {
		return $content;
	}
}

?>